Dr. Robert Chase’s surname in House M.D. is Chase. Jesse Spencer played the Australian physician, who joined House’s original diagnostic team alongside Allison Cameron and Eric Foreman.
Chase begins the series as an intensive-care specialist and later develops a career in diagnostic medicine and surgery. His relationship with House changes over time: he is initially a fellow under House’s authority, but his medical judgment and independence become increasingly important as the series progresses.
The original team’s three surnames are often recalled together: Cameron, Chase, and Foreman. That makes Chase easy to confuse with the other two, especially because all three characters work in the same department during the early seasons.
Robert Chase is a fictional character, while Jesse Spencer is the real actor who portrayed him. The character’s full name is Dr. Robert Chase, and “Chase” is the requested single surname.